60
This number is a composite.
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60 is the only known number that is the common pair-sum of two different first runs of consecutive primes with
symmetrical gaps about the center: the first run of 8 (17...43) and the first run of 10 (13...47). Both runs are symmetric about the primorial 30. [Ahmed]
Submitted: 2026-07-09 00:41:06; Last Modified: 2026-07-09 00:42:30.
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